.stg-app {
    --stg-primary: #5b5bd6;
    --stg-primary-strong: #4444b8;
    --stg-primary-soft: #eeeeff;
    --stg-ink: #17172a;
    --stg-muted: #64647a;
    --stg-line: #e7e7ef;
    --stg-surface: #ffffff;
    --stg-surface-soft: #f7f7fb;
    --stg-success: #147a4b;
    --stg-warning: #8a5a00;
    --stg-shadow: 0 18px 55px rgba(27, 27, 60, 0.09);
    width: 100%;
    color: var(--stg-ink);
    font-family: inherit;
    line-height: 1.65;
  }

  .stg-app,
  .stg-app * {
    box-sizing: border-box;
  }

  .stg-app button,
  .stg-app textarea,
  .stg-app input {
    font: inherit;
  }

  .stg-shell {
    width: min(1180px, calc(100% - 40px));
    margin-inline: auto;
  }

  .stg-hero {
    position: relative;
    overflow: hidden;
    padding: clamp(50px, 7vw, 88px) 0 42px;
    background:
      radial-gradient(circle at 8% 15%, rgba(91, 91, 214, 0.15), transparent 30%),
      radial-gradient(circle at 91% 10%, rgba(85, 194, 164, 0.14), transparent 28%),
      linear-gradient(180deg, #fbfbff 0%, #ffffff 100%);
    border-bottom: 1px solid var(--stg-line);
  }

  .stg-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 36px;
    align-items: end;
  }

  .stg-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 14px;
    padding: 7px 12px;
    border: 1px solid #dadafb;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.8);
    color: var(--stg-primary-strong);
    font-size: 0.82rem;
    font-weight: 750;
    letter-spacing: 0.02em;
  }

  .stg-eyebrow-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #25a36f;
    box-shadow: 0 0 0 4px rgba(37, 163, 111, 0.12);
  }

  .stg-app h1,
  .stg-app h2,
  .stg-app h3 {
    color: var(--stg-ink);
    line-height: 1.18;
    letter-spacing: -0.025em;
  }

  .stg-app h1 {
    max-width: 780px;
    margin: 0;
    font-size: clamp(2.25rem, 5.4vw, 4.65rem);
    font-weight: 850;
  }

  .stg-hero-copy {
    max-width: 760px;
    margin: 18px 0 0;
    color: var(--stg-muted);
    font-size: clamp(1rem, 1.8vw, 1.2rem);
  }

  .stg-hero-example {
    min-width: 220px;
    padding: 18px 20px;
    border: 1px solid rgba(91, 91, 214, 0.16);
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.76);
    box-shadow: 0 10px 30px rgba(36, 36, 76, 0.06);
    backdrop-filter: blur(8px);
  }

  .stg-hero-example span {
    display: block;
    color: var(--stg-muted);
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
  }

  .stg-hero-example strong {
    display: block;
    margin-top: 8px;
    color: var(--stg-primary-strong);
    font-size: 1.3rem;
    overflow-wrap: anywhere;
  }

  .stg-benefits {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 22px;
    margin-top: 24px;
    color: #45455c;
    font-size: 0.93rem;
    font-weight: 650;
  }

  .stg-benefit {
    display: inline-flex;
    align-items: center;
    gap: 8px;
  }

  .stg-check {
    display: inline-grid;
    width: 20px;
    height: 20px;
    place-items: center;
    border-radius: 50%;
    background: #e8f7f0;
    color: var(--stg-success);
    font-size: 0.75rem;
  }

  .stg-tool-section {
    padding: 42px 0 clamp(58px, 7vw, 86px);
  }

  .stg-tool {
    border: 1px solid var(--stg-line);
    border-radius: 28px;
    background: var(--stg-surface);
    box-shadow: var(--stg-shadow);
  }

  .stg-input-panel {
    padding: clamp(20px, 3vw, 32px);
    border-bottom: 1px solid var(--stg-line);
    background: linear-gradient(135deg, #ffffff 0%, #fafaff 100%);
    border-radius: 28px 28px 0 0;
  }

  .stg-label-row,
  .stg-results-head,
  .stg-card-head,
  .stg-tool-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
  }

  .stg-field-label {
    margin: 0;
    color: var(--stg-ink);
    font-size: 0.93rem;
    font-weight: 800;
  }

  .stg-count {
    color: var(--stg-muted);
    font-size: 0.82rem;
    font-variant-numeric: tabular-nums;
  }

  .stg-input-wrap {
    position: relative;
    margin-top: 10px;
  }

  .stg-input {
    display: block;
    width: 100%;
    min-height: 145px;
    resize: vertical;
    padding: 18px 18px 54px;
    border: 1px solid #dcdce8;
    border-radius: 18px;
    outline: none;
    background: #ffffff;
    color: var(--stg-ink);
    font-size: 1.05rem;
    line-height: 1.6;
    transition: border-color 0.18s ease, box-shadow 0.18s ease;
  }

  .stg-input:focus {
    border-color: var(--stg-primary);
    box-shadow: 0 0 0 4px rgba(91, 91, 214, 0.12);
  }

  .stg-inline-actions {
    position: absolute;
    right: 12px;
    bottom: 11px;
    display: flex;
    gap: 8px;
  }

  .stg-btn {
    display: inline-flex;
    min-height: 42px;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 9px 14px;
    border: 1px solid transparent;
    border-radius: 11px;
    cursor: pointer;
    font-weight: 760;
    line-height: 1;
    text-decoration: none;
    transition: transform 0.16s ease, background 0.16s ease, border-color 0.16s ease;
  }

  .stg-btn:hover {
    transform: translateY(-1px);
  }

  .stg-btn:focus-visible,
  .stg-output:focus-visible,
  .stg-faq summary:focus-visible {
    outline: 3px solid rgba(91, 91, 214, 0.28);
    outline-offset: 2px;
  }

  .stg-btn-primary {
    background: var(--stg-primary);
    color: #ffffff;
  }

  .stg-btn-primary:hover {
    background: var(--stg-primary-strong);
  }

  .stg-btn-soft {
    border-color: #dedef4;
    background: var(--stg-primary-soft);
    color: var(--stg-primary-strong);
  }

  .stg-btn-plain {
    border-color: var(--stg-line);
    background: #ffffff;
    color: #3e3e55;
  }

  .stg-results {
    padding: clamp(20px, 3vw, 32px);
  }

  .stg-results-head {
    align-items: flex-end;
    margin-bottom: 18px;
  }

  .stg-results-head h2 {
    margin: 0;
    font-size: clamp(1.35rem, 2.3vw, 1.8rem);
  }

  .stg-results-head p {
    margin: 6px 0 0;
    color: var(--stg-muted);
    font-size: 0.92rem;
  }

  .stg-output-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .stg-output-card {
    position: relative;
    min-width: 0;
    padding: 18px;
    border: 1px solid var(--stg-line);
    border-radius: 18px;
    background: #ffffff;
    transition: border-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
  }

  .stg-output-card:hover {
    border-color: #d5d5ee;
    box-shadow: 0 12px 30px rgba(35, 35, 75, 0.07);
    transform: translateY(-1px);
  }

  .stg-style-meta {
    min-width: 0;
  }

  .stg-style-name {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0;
    font-size: 0.98rem;
    font-weight: 820;
  }

  .stg-style-badge {
    display: inline-flex;
    padding: 3px 7px;
    border-radius: 999px;
    background: #eff8f4;
    color: var(--stg-success);
    font-size: 0.66rem;
    font-weight: 850;
    letter-spacing: 0.04em;
    text-transform: uppercase;
  }

  .stg-style-desc {
    margin: 4px 0 0;
    color: var(--stg-muted);
    font-size: 0.78rem;
  }

  .stg-copy {
    min-width: 76px;
  }

  .stg-output {
    min-height: 88px;
    margin-top: 14px;
    padding: 14px;
    border: 1px solid #ededf4;
    border-radius: 13px;
    background: var(--stg-surface-soft);
    color: #23233b;
    font-size: 1.08rem;
    line-height: 1.65;
    overflow-wrap: anywhere;
    white-space: pre-wrap;
    user-select: all;
  }

  .stg-empty {
    color: #9999aa;
    font-size: 0.92rem;
  }

  .stg-tool-actions {
    flex-wrap: wrap;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--stg-line);
  }

  .stg-action-group {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
  }

  .stg-privacy {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--stg-muted);
    font-size: 0.84rem;
  }

  .stg-notice {
    display: none;
    margin-top: 16px;
    padding: 12px 14px;
    border: 1px solid #f0dbac;
    border-radius: 12px;
    background: #fff9eb;
    color: #6e4900;
    font-size: 0.88rem;
  }

  .stg-notice.is-visible {
    display: block;
  }

  .stg-content {
    padding: clamp(58px, 8vw, 96px) 0;
    border-top: 1px solid var(--stg-line);
    background: #ffffff;
  }

  .stg-content-section + .stg-content-section {
    margin-top: clamp(58px, 7vw, 84px);
  }

  .stg-section-heading {
    max-width: 760px;
    margin-bottom: 26px;
  }

  .stg-kicker {
    margin: 0 0 8px;
    color: var(--stg-primary-strong);
    font-size: 0.78rem;
    font-weight: 850;
    text-transform: uppercase;
    letter-spacing: 0.1em;
  }

  .stg-section-heading h2 {
    margin: 0;
    font-size: clamp(1.75rem, 3.2vw, 2.65rem);
  }

  .stg-section-heading p {
    margin: 12px 0 0;
    color: var(--stg-muted);
    font-size: 1.02rem;
  }

  .stg-two-col {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }

  .stg-copy-block {
    padding: clamp(22px, 3vw, 30px);
    border: 1px solid var(--stg-line);
    border-radius: 20px;
    background: var(--stg-surface-soft);
  }

  .stg-copy-block h3 {
    margin: 0 0 10px;
    font-size: 1.16rem;
  }

  .stg-copy-block p {
    margin: 0;
    color: #505066;
  }

  .stg-copy-block p + p {
    margin-top: 12px;
  }

  .stg-style-guide {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .stg-guide-card {
    padding: 20px;
    border: 1px solid var(--stg-line);
    border-radius: 18px;
    background: #ffffff;
  }

  .stg-guide-sample {
    min-height: 46px;
    margin-bottom: 12px;
    color: var(--stg-primary-strong);
    font-size: 1.15rem;
    font-weight: 760;
    overflow-wrap: anywhere;
  }

  .stg-guide-card h3 {
    margin: 0;
    font-size: 1rem;
  }

  .stg-guide-card p {
    margin: 8px 0 0;
    color: var(--stg-muted);
    font-size: 0.9rem;
  }

  .stg-steps {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    counter-reset: stg-step;
  }

  .stg-step {
    counter-increment: stg-step;
    padding: 22px;
    border: 1px solid var(--stg-line);
    border-radius: 18px;
  }

  .stg-step::before {
    display: grid;
    width: 38px;
    height: 38px;
    margin-bottom: 16px;
    place-items: center;
    border-radius: 12px;
    background: var(--stg-primary-soft);
    color: var(--stg-primary-strong);
    content: counter(stg-step);
    font-weight: 850;
  }

  .stg-step h3 {
    margin: 0;
    font-size: 1rem;
  }

  .stg-step p {
    margin: 7px 0 0;
    color: var(--stg-muted);
    font-size: 0.92rem;
  }

  .stg-table-wrap {
    overflow-x: auto;
    border: 1px solid var(--stg-line);
    border-radius: 18px;
  }

  .stg-table {
    width: 100%;
    min-width: 690px;
    border-collapse: collapse;
    background: #ffffff;
  }

  .stg-table th,
  .stg-table td {
    padding: 15px 17px;
    border-bottom: 1px solid var(--stg-line);
    text-align: left;
    vertical-align: top;
  }

  .stg-table th {
    background: var(--stg-surface-soft);
    color: #3f3f55;
    font-size: 0.82rem;
    letter-spacing: 0.03em;
    text-transform: uppercase;
  }

  .stg-table tr:last-child td {
    border-bottom: 0;
  }

  .stg-status {
    white-space: nowrap;
    font-weight: 780;
  }

  .stg-status-good { color: var(--stg-success); }
  .stg-status-mixed { color: var(--stg-warning); }

  .stg-faq-list {
    display: grid;
    gap: 12px;
  }

  .stg-faq {
    border: 1px solid var(--stg-line);
    border-radius: 16px;
    background: #ffffff;
  }

  .stg-faq summary {
    position: relative;
    padding: 18px 52px 18px 20px;
    cursor: pointer;
    font-weight: 800;
    list-style: none;
  }

  .stg-faq summary::-webkit-details-marker {
    display: none;
  }

  .stg-faq summary::after {
    position: absolute;
    top: 50%;
    right: 20px;
    content: "+";
    color: var(--stg-primary-strong);
    font-size: 1.35rem;
    transform: translateY(-50%);
  }

  .stg-faq[open] summary::after {
    content: "−";
  }

  .stg-faq-answer {
    padding: 0 20px 20px;
    color: var(--stg-muted);
  }

  .stg-faq-answer p {
    margin: 0;
  }

  .stg-tools-directory {
    position: relative;
  }

  .stg-tools-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .stg-tool-link {
    position: relative;
    display: flex;
    min-width: 0;
    min-height: 164px;
    flex-direction: column;
    justify-content: space-between;
    gap: 18px;
    padding: 22px;
    border: 1px solid var(--stg-line);
    border-radius: 20px;
    background: #ffffff;
    color: var(--stg-ink);
    text-decoration: none;
    box-shadow: 0 8px 24px rgba(31, 31, 67, 0.045);
    transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
  }

  .stg-tool-link:hover {
    border-color: #cfcff0;
    background: #fbfbff;
    box-shadow: 0 16px 34px rgba(35, 35, 75, 0.08);
    color: var(--stg-primary-strong);
    transform: translateY(-3px);
  }

  .stg-tool-link:focus-visible {
    outline: 3px solid rgba(91, 91, 214, 0.28);
    outline-offset: 3px;
  }

  .stg-tool-link[aria-current="page"] {
    border-color: #cfcff4;
    background: linear-gradient(145deg, #f7f7ff 0%, #f7fcfa 100%);
  }

  .stg-tool-link-top {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 14px;
  }

  .stg-tool-icon {
    display: grid;
    width: 44px;
    height: 44px;
    flex: 0 0 44px;
    place-items: center;
    border: 1px solid #dedef4;
    border-radius: 14px;
    background: var(--stg-primary-soft);
    color: var(--stg-primary-strong);
    font-size: 1.02rem;
    font-weight: 850;
    line-height: 1;
  }

  .stg-current-badge {
    display: inline-flex;
    align-items: center;
    min-height: 27px;
    padding: 4px 9px;
    border-radius: 999px;
    background: #e8f7f0;
    color: var(--stg-success);
    font-size: 0.7rem;
    font-weight: 850;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    white-space: nowrap;
  }

  .stg-tool-link h3 {
    margin: 0;
    color: inherit;
    font-size: 1.08rem;
  }

  .stg-tool-link p {
    margin: 7px 0 0;
    color: var(--stg-muted);
    font-size: 0.9rem;
    line-height: 1.55;
  }

  .stg-tool-link-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    color: var(--stg-primary-strong);
    font-size: 0.82rem;
    font-weight: 800;
  }

  .stg-tool-arrow {
    display: inline-grid;
    width: 30px;
    height: 30px;
    flex: 0 0 30px;
    place-items: center;
    border-radius: 50%;
    background: var(--stg-primary-soft);
    font-size: 1rem;
    transition: transform 0.18s ease;
  }

  .stg-tool-link:hover .stg-tool-arrow {
    transform: translateX(3px);
  }

  .stg-linking-copy {
    padding: clamp(24px, 4vw, 38px);
    border: 1px solid #dedef4;
    border-radius: 22px;
    background: linear-gradient(135deg, #f8f8ff 0%, #f5fbf9 100%);
  }

  .stg-linking-copy h2 {
    margin: 0 0 14px;
    font-size: clamp(1.55rem, 3vw, 2.2rem);
  }

  .stg-linking-copy p {
    margin: 0;
    color: #505066;
  }

  .stg-linking-copy p + p {
    margin-top: 12px;
  }

  .stg-toast {
    position: fixed;
    z-index: 99999;
    right: 20px;
    bottom: 20px;
    max-width: min(360px, calc(100% - 40px));
    padding: 12px 16px;
    border-radius: 12px;
    background: #17172a;
    color: #ffffff;
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.2);
    font-size: 0.9rem;
    font-weight: 700;
    opacity: 0;
    pointer-events: none;
    transform: translateY(10px);
    transition: opacity 0.2s ease, transform 0.2s ease;
  }

  .stg-toast.is-visible {
    opacity: 1;
    transform: translateY(0);
  }

  @media (max-width: 900px) {
    .stg-hero-grid {
      grid-template-columns: 1fr;
      align-items: start;
    }

    .stg-hero-example {
      width: min(420px, 100%);
    }

    .stg-style-guide,
    .stg-tools-grid {
      grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .stg-steps {
      grid-template-columns: 1fr;
    }
  }

  @media (max-width: 720px) {
    .stg-shell {
      width: min(100% - 28px, 1180px);
    }

    .stg-hero {
      padding-top: 42px;
    }

    .stg-output-grid,
    .stg-two-col,
    .stg-tools-grid {
      grid-template-columns: 1fr;
    }

    .stg-results-head,
    .stg-tool-actions {
      align-items: stretch;
      flex-direction: column;
    }

    .stg-action-group {
      width: 100%;
    }

    .stg-action-group .stg-btn {
      flex: 1 1 auto;
    }
  }

  @media (max-width: 480px) {
    .stg-shell {
      width: min(100% - 20px, 1180px);
    }

    .stg-tool {
      border-radius: 20px;
    }

    .stg-input-panel {
      border-radius: 20px 20px 0 0;
    }

    .stg-input {
      min-height: 132px;
      padding: 15px 15px 60px;
    }

    .stg-inline-actions {
      left: 10px;
      right: 10px;
    }

    .stg-inline-actions .stg-btn {
      flex: 1;
    }

    .stg-card-head {
      align-items: flex-start;
    }

    .stg-copy {
      min-width: 68px;
      padding-inline: 10px;
    }

    .stg-style-guide {
      grid-template-columns: 1fr;
    }

    .stg-benefits {
      display: grid;
      gap: 10px;
    }
  }

  @media (prefers-reduced-motion: reduce) {
    .stg-app *,
    .stg-app *::before,
    .stg-app *::after {
      scroll-behavior: auto !important;
      transition: none !important;
    }
  }

  .stg-app .stg-output {
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
  }

  .stg-app .stg-input {
    -webkit-appearance: none;
    appearance: none;
  }

  .stg-app [hidden] {
    display: none !important;
  }

  /* WordPress/theme conflict protection. */
  .stg-app .stg-btn {
    -webkit-appearance: none;
    appearance: none;
    margin: 0;
    box-shadow: none;
    text-transform: none;
    white-space: nowrap;
  }

  .stg-app .stg-btn:disabled {
    cursor: not-allowed;
    opacity: 0.6;
    transform: none;
  }

  .stg-app textarea.stg-input {
    margin: 0;
    box-shadow: none;
  }

  /* Above-the-fold layout: keep the page heading and converter visible together. */
  .stg-hero {
    padding: clamp(28px, 4vw, 48px) 0 clamp(58px, 6vw, 78px);
  }

  .stg-app h1 {
    font-size: clamp(2.35rem, 4.6vw, 3.9rem);
  }

  .stg-hero-copy {
    margin-top: 12px;
    font-size: clamp(0.98rem, 1.45vw, 1.1rem);
    line-height: 1.55;
  }

  .stg-benefits {
    margin-top: 16px;
  }

  .stg-tool-section {
    position: relative;
    z-index: 2;
    margin-top: -44px;
    padding: 0 0 clamp(52px, 6vw, 76px);
  }

  .stg-tool {
    box-shadow: 0 20px 58px rgba(27, 27, 60, 0.12);
  }

  @media (max-width: 900px) {
    .stg-hero {
      padding: 26px 0 60px;
    }

    .stg-hero-grid {
      gap: 18px;
    }

    .stg-hero-example {
      display: none;
    }

    .stg-tool-section {
      margin-top: -38px;
    }
  }

  @media (max-width: 720px) {
    .stg-hero {
      padding: 18px 0 50px;
    }

    .stg-eyebrow {
      margin-bottom: 8px;
      padding: 5px 9px;
      font-size: 0.72rem;
    }

    .stg-app h1 {
      font-size: clamp(2rem, 10vw, 2.7rem);
      line-height: 1.08;
    }

    .stg-hero-copy {
      margin-top: 9px;
      font-size: 0.94rem;
      line-height: 1.45;
    }

    .stg-benefits {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 8px 12px;
      margin-top: 12px;
      font-size: 0.82rem;
    }

    .stg-benefit {
      gap: 6px;
    }

    .stg-check {
      width: 18px;
      height: 18px;
    }

    .stg-tool-section {
      margin-top: -32px;
      padding-bottom: 48px;
    }

    .stg-input-panel,
    .stg-results {
      padding: 16px;
    }

    .stg-input {
      min-height: 112px;
    }
  }

  @media (max-width: 480px) {
    .stg-hero {
      padding-top: 14px;
    }

    .stg-hero-copy {
      max-width: 37rem;
    }

    .stg-input-panel {
      padding: 14px;
    }

    .stg-input {
      min-height: 104px;
      padding: 13px 13px 56px;
    }

    .stg-label-row {
      align-items: flex-start;
    }

    .stg-count {
      font-size: 0.74rem;
      text-align: right;
    }
  }